Lifting-jack.



PATBNTED Nov. 6,1906.. N. WBILBR.v LIPTING JACK.

a... NAIN mamy, n. c.

PPLIOATION FILED 00T. 30. 1905.

the springs are shown in full.

NICHOLAS WEI-LER, OF SIOUX CITY, IOWA.

VLIFTlNGwdACK.

No. 835,048.l

Specification of Letters Patent.

Patented Nov. 6,1906.

Application ried october 30,1905. .serial No. 285.186.

To @ZZ whom it may concern.-

Be it known that I, NICHOLAS WEILER, a citizen of the United States, and a resident of Sioux City, in the county of Woodbury and State of Iowa, have invented a new and useful Improvement in Triple-Lever Lifting- Jacks; and I do declare the following to be a full, clear, and exact descri tion of the same, reference being had to t e accompanying drawings, forming a part thereof.

My invention relates to means for raising heavy loads; and the object of the invention is to produce a new and improved liftin jack operated by triple levers which whi e raisinga load by the step-byste movement may be quickly reversed and t e load lowered. This. Iaccomplish by the mechanism shown in the accompanying drawings, in which- Figure 1 is a longitudinal sectional view showing one-half of the machine, except that Fig. 2 is a similar view of the operating parts as the same are adjusted in raising the load. Fig. 3 is a view similar to Fig. 2, but showing the machine reversed with the lower pawl engaged. Fig. 4 is the same as Fig. 3, except that the upper pawl is engaged.

Like parts are designated by similar letters of reference throughout the several views.

In the drawings, A is a hollow frame adapt ed as a sup ort and guide for the hollow toothed bar On each side of the face of the frame, formed integral therewith, are cogged segments C, in which the cogged forks D of the lever E are ada ted to mesh. Iivotally secured to the sides o the frame by the short shafts a and b, respectively, are the parallel bars F and G, the former set being above the latter and both working in the same plane. The inner ends of the bars F are connected by the shaft c between the shaft a and the toothed bar and the inner ends of the bars G by the shaft d outside of the shaft b, the ends of the shafts c and'd being firmly secured to said bars. The outer ends of thebars F are connected by a bolt H passing freely through them and serving also as an axis or fulcrum for the forked lever E. The outer ,ends of the bars G are connected in the same manner by a bolt I. The two sets of parallel bars F and G are adapted to act together by means of u right parallel bars J, which connect them, t e upright bars being of triangular shape, the inner angle facing the frame of the jack. The bolts I-I I and I pass, respectively, throu h the upper and lower ends of the uprightk ars, serving as fulcrums for the bars. A pawl K, having an enlarged head, the front of which is forked' to inclose the shaft c as a fulcrum,.isadapted to engage the toothed bar, the stem being rounded and supported freely in the openingl of a flat iece M, secured to a barA,l connectin t e sides of the frame, by screws e.

A simi ar pawl L o erates on the shaft d, therounded stem of t e pawl being freely supported in the flat piece M. A flat s ring N 1s freely secured to-the outer end of t e'pawl K by means of a threaded bolt f and nut g, and the u per part of the spring is freely secured to the piece M by a screw h. A similar spring O is secured to the lower pawlL by a threaded bolt L and nut j, the lower partv being freely secured to the iece M by a screw c. The free ends of t e springs are bent outward, as shown in the-drawings,.for n a purpose presently described.

As` the axis or fulcrum of the awl K isbetween the axis of the bars F an ythe toothed bar, when the-operating-lever is lowered and the outer ends of the bars lowered with it the inner end of the pawl will be raised, as indicated in Fig.V 2, andthe pawl being forced into engagement with the toothed bar by the spring the bar will be carried up. The fulcrum of the lower awl being outside the fulcrum of the bars the movement of the lever which raises the upper pawl will lower the lower one, which slip's'by the teeth, and vice versa. The pawls thus alternately engage the bar when a reci rocating'movement is applied to the lever. PIhe upper and lower pawls being thus fulcrumed may be described as levers of the first and second'classes, respectively, and the sets of parallel bars between which the pawls are respectivly supported being connected by the upright bars J' they are operated together, and thus al-'l ternately raisethe load.

The triple leverage of the pawls, parallelv bars, and the operating-lever fulcrumed to IOO the bars and to the frame are all combined to raise the load in the manner described.

When it is desirrd to lower the load in the 1;

same step-by-step process, a pin l is inserted through the holes m in the upright bars J. As the operating-lever is raised the pin is carried up by the bars J between the spring N and the fiat iece M., which forces the pawl K outward. s the lever is lowered the pin is brought down between the spring O and the piece M,nwhichY forces out the pawl L.Y By Y thus throwing one of the pawls outward at each stroke of the Iever the load is lowered instead of raised. The free ends of the springs are curved outward in order that in Whatever relative position the springs and pin may beV the pin will pass under the springs upon coming in contact with them,

as seen in Figs. 3 and 4.

The frame is open at the back, and an ear B', formed integral with the lower end of the upright bar B, extends through the open space and bears the rollers n on a shaft o, the rollers by contact with the adjacent sides of the frame tending to reduce the friction of the bar on the frame caused by the load. The rear of the hollow bar is provided with slots p p, into which may be hookedthe foot P. The foot is for raising low objects and may be adjusted in the slots to the height of the load it is desired to carry.

Having described my invention, what I claim as newand desire to secure by Letters Patent, is*- 1. The combination with an upright movable bar having teeth on one side thereof, and a frame supporting said bar, of normally horizontal bars fulorumed to the frame, a pawl fulcrumed to said bars between the fulcrum of the bars and the toothed bar and adapted to engage said toothed bar, normally horizontal bars fulcrumed to the frame underneath said pawl, a pawl fulcrumed to said bars outside the fulcrum of said bars and adapted to engage the toothed bar, springs for normally holding said pawls in engagement, upright bars connecting the outer ends of said parallel bars, and a lever fulcrumed to the frame and also to the outer ends of said parallel bars, substantially as described.

2. The combination with an upright movable bar having teeth on one side thereof and a frame supporting said bar, of normally horizontal bars fulcrumed to the frame,

pawls supported by said bars and adapted for engagement with said toothed bar, springs secured to said frame and attached to said pawls Vfor normally holding said pawls in engagement, upright bars connecting the outer ends of said horizontal bars, an operating-lever fulcrumed to the horizontal bars for alternately raising and lowering said bars, and a pin supported by said upright bars and adapted to bey interposed alternately between said springs and the frame whereby the pawls are thrown out of engagement and the movement ofthe toothed bar reversed, substantially as described.

3. In a lever lifting-jack, the combination with normally horizontal bars pivotally secured to a supporting-frame, pawls pivotally supported by said bars and adapted to engage a toothed bar whereby the load is raised springs secured to the frame and to said pawls and adapted to press the pawls into engagement with the toothed bar, and a lever pivotally secured to said horizontal bars, of a pin adapted to be interposed between said springs and the frame, whereby the pawls are alternately thrown out of engagement and the movement of the toothed bar reversed, substantially as described.

4. In a lever lifting-j ack, the combination with normally horizontal bars pivotally secured to a supporting-frame, pawls pivotally supported by said bars and adapted to engage a toothed bar whereby the load is raised, flat springs secured to the frame and to said pawls to hold the pawls in engagement, and an operating-lever pivotally secured to said horizontal bars, of upright bars pivotally secured to said lever and to said horizontal bars, and a pin supported by said upright bars and adapted to be interposed alternately between said springs and the frame whereby the pawls are thrown out of engagement and the movement of the toothed bar reversed, substantially as described.

5. In a lever lifting-jack, the combination with an upright movable bar having teeth on one side thereof and a frame supporting said bar, of pawls pivotally secured to the frame, springs secured to said frame and to said pawls for holding the pawls in engagement with said toothed bar, a lever pivotally secured to said frame and to said pawls for o erating said pawls, and a pin adapted to e interposed between said springs and the frame for throwing the pawls out of engagement, substantially as described.

In witness whereof I have hereunto affixed my signature in the presence of two witnesses.

NICHOLAS WEILER. Witnesses F. W. LoHR, H. C. GARDINER.

IOO 

